US10436509B2 - Electrode roll drying method, and electrode roll drying device - Google Patents

Electrode roll drying method, and electrode roll drying device Download PDF

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US10436509B2
US10436509B2 US15/024,080 US201415024080A US10436509B2 US 10436509 B2 US10436509 B2 US 10436509B2 US 201415024080 A US201415024080 A US 201415024080A US 10436509 B2 US10436509 B2 US 10436509B2
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Prior art keywords
electrode roll
electrode
drying
side heater
heating
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US20160216031A1 (en
Inventor
Hiroki Fujiwara
Masahiko Sugiyama
Seigo Komatsu
Takeshi Iwata
Keisuke Uekusa
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Envision AESC Japan Ltd
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Nissan Motor Co Ltd
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Assigned to NISSAN MOTOR CO., LTD. reassignment NISSAN MOTOR CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KOMATSU, SEIGO, SUGIYAMA, MASAHIKO, FUJIWARA, HIROKI, UEKUSA, Keisuke, IWATA, TAKESHI
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/10—Temperature; Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
    • F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/04—Heating arrangements using electric heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
    • F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to an electrode roll drying method, and an electrode roll drying device.
  • Winding pressure is high at the winding core side of the electrode roll, and causing the water to escape is difficult.
  • the present Applicant has proposed a technique to dry an electrode roll by heating from the winding core side. (Refer to Japanese Laid Open Patent Application 2011-169499).
  • an object of the present invention is to provide an electrode roll drying method, and an electrode roll drying device which embodies the method, that can shorten the drying time of the electrode roll, by giving suitable conditions for when combining heating from the winding core side of the electrode roll and heating from the outer-side of the electrode roll.
  • An electrode roll drying method of the present invention which achieves the above object is to heat the electrode roll formed from an electrode base material wound around a winding core from both the outer and winding core sides in a drying oven.
  • a target temperature that is lower than that is allowed as the upper limit temperature at the outermost portion
  • heating from the outer-side is stopped, the pressure within the drying oven is reduced, and heating from the winding core side and pressure reduction is carried out.
  • An electrode roll drying device of the present invention which achieves the above object comprises a drying oven, an outer-side heater, an axial-side heater, a pressure reducer, a sensor, and a control unit.
  • the drying oven houses an electrode roll configured from an electrode base material wound around a winding core.
  • the outer-side heater heats the electrode roll housed in the drying oven from the outer-side.
  • the axial-side heater heats the electrode roll housed in the drying oven from the winding core side.
  • the pressure reducer reduces the internal pressure of the drying oven.
  • the sensor detects the temperature of the outermost portion of the electrode roll.
  • the control unit controls the operation of the outer-side heater, the axial-side heater, and the pressure reducer based on the temperature of the outermost portion of the electrode roll detected by the sensor.
  • the control unit operates the outer-side heater and the axial-side heater and heats the electrode roll from both the outer and winding core sides. If the temperature of the outermost portion of the electrode roll reaches a target temperature that is lower than that is allowed as the upper limit temperature at the outermost portion, the control unit stops the operation of the outer-side heater, and operates the pressure reducer to reduce the pressure within the drying oven. Heating by the axial-side heater and pressure reduction by the pressure reducer is thereby carried out.
  • FIG. 1 is a schematic block diagram showing an electrode roll drying device according to an embodiment of the present invention.
  • FIG. 2 is a perspective view showing an electrode roll.
  • FIG. 3 is a schematic cross-section view showing an example of an electrical device to which an electrode formed by cutting an electrode base material of an electrode roll is applied.
  • FIG. 4 is a schematic view showing the position to which thermocouples are set in a drying test of an electrode roll.
  • FIG. 5A is a graph showing the temperature change of an electrode roll during a drying operation.
  • FIG. 5B is a time-chart showing the operation status of an outer-side heater, an axial-side heater, and a pressure reducer.
  • FIG. 6 is a cross-sectional view showing an electrode roll drying device according to a modified example.
  • FIG. 1 is a schematic block diagram showing a drying device 10 of an electrode roll 20 according to an embodiment of the present invention
  • FIG. 2 is a perspective view showing an electrode roll 20
  • FIG. 3 is a schematic cross-section view showing an example of an electrical device to which an electrode formed by cutting an electrode base material 21 of an electrode roll 20 is applied.
  • a drying device 10 of an electrode roll 20 comprises a drying oven 30 , an outer-side heater 40 , an axial-side heater 50 , a pressure reducer 60 , a sensor 70 , and a control unit 80 .
  • the drying oven 30 houses an electrode roll 20 configured from an electrode base material 21 wound around a winding core 22 .
  • the outer-side heater 40 heats the electrode roll 20 housed in the drying oven 30 from the outer-side.
  • the axial-side heater 50 heats the electrode roll 20 housed in the drying oven 30 from the winding core 22 side.
  • the pressure reducer 60 reduces the internal pressure of the drying oven 30 .
  • the sensor 70 detects the temperature of the outermost portion of the electrode roll 20 .
  • the control unit 80 controls the operation of the outer-side heater 40 , the axial-side heater 50 , and the pressure reducer 60 based on the temperature of the outermost portion of the electrode roll 20 detected by the sensor 70 .
  • the control unit 80 operates the outer-side heater 40 and the axial-side heater 50 to heat the electrode roll 20 from both the outer and winding core 22 sides. If the temperature of the outermost portion of the electrode roll 20 reaches a target temperature that is lower than that is allowed as the upper limit temperature at the outermost portion, the control unit 80 stops the operation of the outer-side heater 40 , and operates the pressure reducer 60 to reduce the pressure within the drying oven 30 .
  • heating by the axial-side heater 50 and pressure reduction by the pressure reducer 60 is carried out. The details are described below.
  • An electrode roll 20 is configured from a long electrode base material 21 wound around a hollow winding core 22 , as also illustrated in FIG. 2 .
  • the electrode base material 21 is configured from active material layers formed on both sides of a current collector.
  • An electrode is formed by the electrode base material being 21 sent out from the winding core 22 , and cut to a predetermined length.
  • Drying the power generating element after forming the power generating element comprising an electrode is also conceivable.
  • various battery elements are mixed in power generating elements, there are cases in which the necessary heat to remove water cannot be applied to the electrode and water removal becomes insufficient.
  • drying in the form of the electrode roll 20 prior to cutting the electrode base material 21 is desirable.
  • the drying oven 30 comprises an openable door part 31 , and the electrode roll 20 is taken in and out through the opened door part 31 .
  • the drying oven 30 is configured from a vacuum chamber in which airtightness is heightened so that air does not flow into the inner portion after pressure reduction.
  • An inner portion of the drying oven 30 comprises a support member 32 for supporting the housed electrode roll 20 .
  • the support member 32 comprises a support leg 33 which is fixed to the floor surface of the drying oven 30 , and a support sieve part 34 which is detachably mounted to the support leg 33 .
  • the support sieve part 34 is freely insertable into the winding core 22 of the electrode roll 20 .
  • the support member 32 supports the electrode roll 20 by mounting the support sieve part 34 , which is inserted into the winding core 22 , to the support leg 33 .
  • the outer-side heater 40 is disposed to a wall surface of the drying oven 30 which faces the surface of the electrode roll 20 , and transfers heat towards the core portion from the surface of the electrode roll 20 . In the case of rotationally driving and drying an electrode roll 20 , the number of outer-side heaters 40 to be installed can be reduced.
  • the axial-side heater 50 is disposed on the axial center of the support sieve part 34 , and transfers heat towards the surface from the core portion of the electrode roll 20 .
  • the outer-side heater 40 and the axial-side heater 50 are configured from electric heaters.
  • the outer-side heater 40 is connected to a power supply unit via a switch 41 for turning conduction on and off.
  • the switching between heating start and heating stop of the outer-side heater 40 is carried out by operating the switch 41 .
  • the axial-side heater 50 in the same manner, is connected to a power supply unit via a switch 51 for turning conduction on and off.
  • the switching between heating start and heating stop of the axial-side heater 50 is carried out by operating the switch 51 .
  • the pressure reducer 60 is configured from a vacuum pump, and discharges the air in the inner portion of the drying oven 30 to the outer portion.
  • the pressure reducer 60 reduces the pressure in the drying oven 30 from an atmospheric pressure state to a vacuum state.
  • the vacuum level although not particularly limited, is, for example, about 1 Torr (133.32 Pa), which is about the same as a general purpose vacuum oven.
  • a general temperature sensor such as a thermocouple can be used for the sensor 70 .
  • the sensor 70 is attached to the surface of the electrode roll 20 , and detects the temperature of the outermost portion of the electrode roll 20 .
  • a non-contact type thermometer such as an infrared radiation thermometer can be used instead of a contact type thermocouple, for the sensor 70 .
  • the control unit 80 comprises a CPU, a RAM, a ROM, a timer, and the like, and carries out the drying of the electrode roll 20 by executing with the CPU a control program stored in the ROM.
  • a signal related to the temperature of the outermost portion of the electrode roll 20 detected by the sensor 70 is inputted to the control unit 80 .
  • a control signal which carries out the switching between heating start and heating stop of the switch 41 for the outer-side heater 40 , a control signal which carries out the switching between heating start and heating stop of the switch 51 for the axial-side heater 50 , and a control signal which carries out the switching between operation start and operation stop of the pressure reducer 60 are outputted from the control unit 80 .
  • FIG. 3 shows a lithium-ion secondary battery 100 as an example of an electrical device.
  • the lithium-ion secondary battery 100 is configured from a power generating element 104 , formed from a negative electrode 101 , a separator 102 , and a positive electrode 103 layer stacked in sequence, which is sealed by an exterior material 105 .
  • the negative electrode 101 is configured from an active material layer formed on both sides of a current collector 101 a .
  • the positive electrode 103 is configured from an active material layer formed on both sides of a current collector 103 a .
  • the separator 102 configures an electrolyte layer by impregnation of electrolytes.
  • the current collector 101 a of the negative electrode 101 is extended and connected to a negative electrode tab 106 for extracting electric power.
  • the current collector 103 a of the positive electrode 103 is extended and connected to a positive tab 107 for extracting electric power. Portions of tabs 106 and 107 protrude to the outer portion from the exterior material 105 .
  • the exterior material 105 is configured from two sheets of superposed laminate film, the peripheral edge portions of which are thermally fused.
  • the negative electrode 101 is manufactured by sending out and then cutting a required length of the electrode roll 20 , which is the electrode base material 21 for the negative electrode 101 wound into a roll.
  • the positive electrode 103 is manufactured by sending out and then cutting a required length of the electrode roll 20 , which is the electrode base material 21 for the positive electrode 103 wound into a roll. Winding the electrode roll 21 into a roll is in consideration of the convenience of transport, and the like.
  • FIG. 4 is a schematic view showing the position to which a thermocouple is set in a drying test of an electrode roll 20
  • FIG. 5A is a graph showing the temperature change of an electrode roll 20 during a drying operation
  • FIG. 5B is a time-chart showing the operation status of an outer-side heater 40 , an axial-side heater 50 , and a pressure reducer 60 .
  • thermocouples are set to position P 1 at the outermost portion of the electrode roll 20 , position P 2 at the core portion of the electrode roll 20 , and position P 3 at a center portion between both positions.
  • the thermocouple is set by being inserted into the radially inward direction from the end surface in the radial direction of the electrode roll 20 , and the heating effect from the end surface in the radial direction is reduced. Temperature is measured at two points that are symmetrical with respect to the axial center, and the average temperature of the two points is employed as the temperature of each of the positions, P 1 , P 2 , and P 3 .
  • FIG. 5A the temperature of the outermost portion of the electrode roll 20 is shown by the solid line, the temperature of the core portion is shown by the dashed-dotted line, and the temperature of the center portion is shown by the chained double dash line.
  • the outer diameter of the electrode roll 20 is increased, and the time needed for transmitting the necessary heat to the outer portion in the radial direction of the electrode roll 20 for drying the water becomes longer, with only the heat conduction from the winding core to the radially outward direction. Consequently, there is the risk of the drying in the outer-side portion of the electrode roll 20 being insufficient.
  • the electrode roll 20 is dried by the following procedure, in order to shorten the drying time of the electrode roll 20 , by giving suitable conditions for when combining heating from the winding core 22 side of the electrode roll 20 and heating from the outer-side of the electrode roll 20 .
  • the electrode roll 20 is housed in the drying oven 30 , the door part 31 is closed, and the drying oven 30 is made to be in a sealed state.
  • the control unit 80 turns on both the switch 41 for the outer-side heater 40 and the switch 51 for the axial-side heater 50 . Heating of the electrode roll 20 from the outer-side is started by the outer-side heater 40 . Heating of the electrode roll 20 from the winding core 22 side is started by the axial-side heater 50 .
  • the control unit 80 keeps the operation of the pressure reducer 60 off.
  • the electrode roll 20 is heated from both the outer and winding core 22 sides, the heat is transmitted in the radial direction of the electrode roll 20 .
  • the temperature of the electrode roll 20 is raised in the order of: the outermost portion; the core portion; and the center portion. Since heat is applied to the electrode roll 20 from both the outer and winding core 22 sides in the radial direction, the heat necessary when drying the electrode roll 20 can be applied evenly and in a short period of time. Growth in the winding direction occurs to the electrode base material 21 due to thermal expansion. A small space is generated between the layers of the wound electrode base material 21 . Water evaporates through the small space.
  • Each element of the electrode base material 21 has a heat-resistant temperature, in relation to the material, and the like. For this reason, in the electrode roll 20 , an allowable temperature (about 120° C.-140° C.) as the upper limit temperature is defined. In the drying operation of the electrode roll 20 , a target temperature lower than the allowable temperature is set as the temperature at the outermost portion of the electrode roll 20 .
  • the target temperature although not particularly limited, is, for example, set to a temperature about 15 degrees lower than the allowable temperature.
  • the control unit 80 detects that the temperature of the outermost portion of the electrode roll 20 has reached the target temperature, then, turns off the switch 41 for the outer-side heater 40 , stops the heating from the outer-side of the electrode roll 20 , reduces the pressure within the drying oven 30 , and carries out pressure reduction and heating from the winding core 22 side.
  • the control unit 80 operates the pressure reducer 60 and reduces the pressure within the drying oven 30 .
  • the pressure reducer 60 By reducing the pressure of the drying oven 30 , the boiling point of water is lowered, water evaporation of the electrode roll 20 is accelerated, and the electrode roll 20 can be dried more quickly.
  • the heat that is necessary to dry the electrode roll 20 to the center portion thereof can be applied in a relatively short period of time after switching to vacuum drying.
  • the temperature of the center portion of the electrode roll 20 is raised in a relatively short period of time, and drying of the electrode base material 21 , which is located in the center portion, where drying is difficult, can be carried out quickly and sufficiently.
  • the waiting time is determined by trial and error in advance, since the waiting time changes according to the material from which the electrode base material 21 is configured.
  • the waiting time shall be the time until the temperature of the center portion of the electrode roll 20 reaches a temperature, for example, about 30 degrees lower than the allowable temperature, when only the heating from the winding core 22 side of the electrode roll 20 is continued.
  • the control unit 80 detects that the temperature of the core portion of the electrode roll 20 has reached the target temperature, then, transitions to a temperature adjustment control in which the switch 51 for the axial-side heater 50 is controlled to turn on/off, and adjusts the temperature so that the temperature of the core portion of the electrode roll 20 is maintained at the target temperature.
  • Heat applied from the outer-side of the electrode roll 20 is transmitted radially inward, heat applied from the winding core 22 side of the electrode roll 20 is transmitted radially outward, and the temperature of the center portion of the electrode roll 20 is raised.
  • a waiting time Prior to switching to vacuum drying, a waiting time is set, and the heat necessary for evaporating the water in the center portion of the electrode roll 20 is applied under atmospheric pressure.
  • the temperature of the center portion of the electrode roll 20 can be sufficiently raised.
  • the pressure of the drying oven 30 the boiling point is lowered, and water evaporation is accelerated. Accordingly, the electrode roll 20 can be dried quickly.
  • the control unit 80 continues the vacuum drying for a predetermined time.
  • the above predetermined time is also determined in advance by trial and error.
  • the predetermined time is set to a time sufficient for the temperature of the center portion of the electrode roll 20 to also reach the target temperature, and the center portion to dry.
  • the operation of the pressure reducer 60 is stopped, the pressure within the drying oven 30 is returned to atmospheric pressure, and the electrode roll 20 is cooled.
  • the dried electrode roll 20 is transported from the drying oven 30 to a dry room, and a battery is manufactured.
  • thermocouples are set to position P 1 at the outermost portion, and position P 2 at the core portion of the electrode roll 20 , and the electrode roll 20 is dried, while the operation of the outer-side heater 40 and the axial-side heater 50 is controlled based on the outermost portion and core portion temperatures.
  • the control unit 80 operates the outer-side heater 40 and the axial-side heater 50 to heat the electrode roll 20 from both the outer and winding core 22 sides, and, if the temperature of the outermost portion of the electrode roll 20 reaches a target temperature that is lower than that is allowed as the upper limit temperature at the outermost portion, stops the operation of the outer-side heater 40 , operates the pressure reducer 60 to reduce the pressure within the drying oven 30 , and carries out the heating by the axial-side heater 50 and the pressure reduction by the pressure reducer 60 .
  • the outermost portion of the electrode roll 20 is controlled so as not to exceed the allowable temperature, and, by reducing the pressure of the drying oven 30 , water evaporation of the electrode roll 20 is accelerated, and the electrode roll 20 can be dried quickly.
  • the control unit 80 operates the pressure reducer 60 to reduce pressure within the drying oven 30 after a waiting time set in advance has elapsed after the operation of the outer-side heater 40 is stopped and heating from the outer-side is stopped.
  • a waiting time set in advance has elapsed after the operation of the outer-side heater 40 is stopped and heating from the outer-side is stopped.
  • the pressure reducer 60 reduces the pressure within the drying oven 30 from an atmospheric pressure state to a vacuum state. According to this configuration, by the pressure reduction of the drying oven 30 , the boiling point of water is lowered, water evaporation of the electrode roll 20 is accelerated, and the electrode roll 20 can be dried more quickly.
  • the outer-side heater 40 and the axial-side heater 50 are configured from electric heaters, and the switching between heating start and heating stop is carried out with a switch. According to this configuration, the switching responsiveness of heat/stop can be improved.
  • FIG. 6 is a cross-sectional view showing a drying device 11 of an electrode roll 20 according to a modified example.
  • Members common with the embodiment are given the same codes, and the explanations thereof are omitted.
  • the drying device 11 of an electrode roll 20 according to the modified example differs from the embodiment in which one electrode roll 20 is housed in a single drying oven 30 in the point that a plurality of electrode rolls 20 are housed in a single drying oven 130 .
  • the drying oven 130 is configured from two stages, upper and lower, to be capable of housing a total of four (two on each stage) electrode rolls 20 .
  • Eight outer-side heaters 40 are mounted to a wall surface, and an axial-side heater 50 is disposed within each axial-center of the four electrode rolls 20 .
  • a sensor 70 for detecting the temperature of the outermost portion is mounted to each electrode roll 20 .
  • a control unit 80 controls the drying for each of the plurality of electrode rolls 20 housed in a single drying oven 130 .
  • control unit 80 operates the outer-side heater 40 and the axial-side heater 50 to heat the electrode roll 20 from both the outer and winding core 22 sides, and, if the temperature of the outermost portion of the electrode roll 20 reaches a target temperature, stops the operation of the outer-side heater 40 , operates the pressure reducer 60 to reduce the pressure within the drying oven 130 , and carries out the heating by the axial-side heater 50 and the pressure reduction by the pressure reducer 60 .
  • each of the electrode rolls 20 is controlled so as not to exceed the allowable temperature, and, by reducing the pressure of the drying oven 130 , water evaporation of each of the electrode rolls 20 is accelerated, and each of the electrode rolls 20 can be dried quickly.
  • the drying oven 130 may be configured to be capable of housing a plurality of electrode rolls 20 arranged on the same axis. In this case as well, the outermost portion of each of the electrode rolls 20 is controlled so as not to exceed the allowable temperature, and, by reducing the pressure of the drying oven 130 , water evaporation of each of the electrode rolls 20 is accelerated, and each of the electrode rolls 20 can be dried quickly.

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US15/024,080 2013-10-07 2014-10-03 Electrode roll drying method, and electrode roll drying device Active 2035-04-30 US10436509B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2013210554 2013-10-07
JP2013-210554 2013-10-07
PCT/JP2014/076594 WO2015053198A1 (ja) 2013-10-07 2014-10-03 電極ロールの乾燥方法、および電極ロールの乾燥装置

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US20160216031A1 US20160216031A1 (en) 2016-07-28
US10436509B2 true US10436509B2 (en) 2019-10-08

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